[U-Boot] Cannot access a FAT filesystem in an El-Torito partition

[Moffett, Kyle D]

On Dec 19, 2011, at 15:21, Kyle Moffett wrote:
> The U-Boot FAT driver appears to manually check for the existence of
> an MS-DOS partition table, even when CONFIG_DOS_PARTITION is present
> and working.
> 
> As a result, it is not possible to use the FAT driver on an ISO9660
> El-Torito boot volume, because it does not have a DOS MBR and does
> not pass the magic number check.
> 
> It looks like the code in the FAT driver to check DOS MBRs is just
> legacy code from before libpart existed, and I would like to remove
> it, except several board configs seem to set CONFIG_CMD_FAT but do
> not set CONFIG_DOS_PARTITION:
>  include/configs/dbau1x00.h
>  include/configs/mv88f6281gtw_ge.h
>  include/configs/hymod.h
>  include/configs/LANTEC.h
>  include/configs/gth2.h
>  include/configs/dreamplug.h
>  include/configs/lacie_kw.h
>  include/configs/dockstar.h
>  include/configs/omap3_evm_common.h
>  include/configs/guruplug.h
>  include/configs/rd6281a.h
>  include/configs/ep8260.h
>  include/configs/sheevaplug.h

Nevermind, I just checked all of these and they do indirectly set
CONFIG_DOS_PARTITION where necessary.

> Can I just modify those board configs to set CONFIG_DOS_PARTITION
> and remove the duplicated FAT-specific partition-table probing
> code or is there something else I should do?

I will be submitting a patch shortly.

Cheers,
Kyle Moffett

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